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In 1904, a 36-MW coal-fired plant was built at Ashley Street to produce steam heat for downtown St. Louis. This plant also served as the main source of electricity for downtown St. Louis for years. It was converted to oil-fired in 1972 and then converted to natural gas-fired in 1996.

With the onset of electric deregulation, a 15-MW CHP plant was installed, which utilizes clean-burning natural gas to produce cogenerated "green steam."